Question #727
Unless the manufacturer specifies otherwise, what is the permissible wear at the throat of a crane hook?
O ile wytwórca nie określi inaczej dopuszczalne wytarcie gardzieli haka żurawia wynosi:
a
5%
5%
b
3%
3%
c
10%
10%
Correct answer
d
All answers are incorrect.
wszystkie odpowiedzi sa niepoprawne
Why?
Permissible hook throat wear (wytarcie gardzieli haka) is 10% of the original thickness at the measurement point, unless the manufacturer specifies otherwise. This means material loss, not an increase in the hook opening. The 5% limit concerns increased throat opening (rozwarcie gardzieli haka), which is a different inspection criterion.